VISA波动器的对准

R. Ruland, D. Arnett, G. Bowden, R. Carr, B. Dix, B. Fuss, C. Le Cocq, Z. Wolf, J. Aspenleiter, G. Rakowsky, J. Skaritka, P. Duffy, M. Libkind
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引用次数: 5

摘要

可见-红外SASE放大器(VISA)波动器由四个99厘米长的片段组成。每个波动器段都设置在脉冲导线台上,以表征磁性并定位FODO阵列的磁轴。随后,由导线定义的磁轴位置通过直线度干涉仪参考每个磁段上的工装球。在真空室中安装后,四个磁体段相对于自身和光束线参考激光器全局对齐。一种专门设计的对准夹具用于在光束的水平和垂直平面上各安装一个直线度干涉仪。这些程序的目标是将由于磁和对准误差引起的综合均方根轨迹误差保持在50 /spl mu/m。
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Alignment of the VISA undulator
The Visible-Infrared SASE Amplifier (VISA) undulator consists of four 99 cm long segments. Each undulator segment is set up on a pulsed-wire bench, to characterize the magnetic properties and to locate the magnetic axis of the FODO array. Subsequently, the location of the magnetic axis, as defined by the wire, is referenced to tooling balls on each magnet segment by means of a straightness interferometer. After installation in the vacuum chamber, the four magnet segments are aligned with respect to themselves and globally to the beam line reference laser. A specially designed alignment fixture is used to mount one straightness interferometer each in the horizontal and vertical plane of the beam. The goal of these procedures is to keep the combined rms trajectory error, due to magnetic and alignment errors, to 50 /spl mu/m.
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